Knapp's book will give you macrons. (Charles Knapp,
Vergil and Ovid, Revised, Scott,Foresman &Co., 1928:
https://www.abebooks.com/servlet/BookDe ... 1-_-title6
There appears to be enough space above each line to place scansion marks. It also has notes in the bottom half of each page, as well as a vocabulary section in the back and an excellent introduction in the front. For what it's worth, I think you may get more benefit from writing out the lines and supplying the scansion to your written copy, rather than writing in a book. You shouldn't have to do this for the whole work, just until you can read the poem aloud metrically. How long that will take depends really on your present knowledge level. Furthermore, try memorising the first few lines (say 20). This will help you develop a feel for the rhythm of the poem and help you to read metrically, which is the real goal. Scansion is just a process to help get you there. Of course, having a solid foundation of vocabulary and grammar also helps.